[3.12] Docs: Add `restart_events()` and positional arg semantics for `sys.monitoring` (GH-111291) (#111335)

Docs: Add `restart_events()` and positional arg semantics for `sys.monitoring` (GH-111291)
(cherry picked from commit 3f84a19e6291db682fc9a570e7612e80e2ffbbb5)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>